IMAGE/HENA: Ring Current-Plasmasphere Interaction

Details IMAGE/HENA: Ring Current-Plasmasphere Interaction IMAGE/HENA: Ring Current-Plasmasphere Interaction

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm52a10c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM52A-10

Physics

2730 Magnetosphere--Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We present global energetic neutral atom (ENA) observations of the ring current during the geomagnetic storm on 24 May, 2000. The observations were carried out by the ENA imager HENA onboard the IMAGE spacecraft. Apart from the main phase of the storm, the convection through the magnetosphere was steady throughout the recovery phase, which lasted approximately three days. A comparison with images of the plasmasphere in extreme ultraviolet (EUV)reveal a spatial relation between the ENA emissions and the plasmasphere. There appears to be a lack of ENA emission coming from regions with enhanced plasmaspheric density (plasmaspheric tail and plasmapause). Data from the Polar satellite suggests that the ring current ion pitch angle distributions (PAD) from the region of enhanced plasmaspheric density are strongly peaked at 90o pitch angle in the magnetic equator. Just outside regions with enhanced plasmaspheric density the PADs are more isotropic. We present a scenario that involves adiabatic drifts and wave particle interactions. We use the University of Michigan version of the kinetic ring current originally developed by V. K. Jordanova to adddress the significance of each mechanism in forming the observed ring current.

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